首先看下面的代碼:
using System; namespace Test { public class Base { public void Print() { Console.WriteLine(Operate(8, 4)); } protected virtual int Operate(int x, int y) { return x + y; } } }
namespace Test { public class OnceChild : Base { protected override int Operate(int x, int y) { return x - y; } } }
namespace Test { public class TwiceChild : OnceChild { protected override int Operate(int x, int y) { return x * y; } } }
namespace Test { public class ThirdChild : TwiceChild { } }
namespace Test { public class ForthChild : ThirdChild { protected new int Operate(int x, int y) { return x / y; } } }
namespace Test { class Program { static void Main(string[] args) { Base b = null; b = new Base(); b.Print(); b = new OnceChild(); b.Print(); b = new TwiceChild(); b.Print(); b = new ThirdChild(); b.Print(); b = new ForthChild(); b.Print(); } } }
看結果:
從結果中可以看出:使用override重寫之後,調用的函數是派生的最遠的那個函數,使用new重寫則是調用new之前的派生的最遠的函數,即把new看做沒有重寫似的。